公开(公告)号：US3899568A

公开(公告)日：1975-08-12

申请号：US47881274

申请日：1974-06-12

Applicant: ALLIED CHEM

Inventor： FRICK DOUGLAS G ,  MORGAN THOMAS R ,  STREETER TERRY L

IPC: C22B34/32 ,  C01F7/14 ,  C01G37/14

CPC classification number: C01G37/14 ,  C01F7/141

Abstract: This invention relates to an improvement in the method for removing dissolved aluminate from alkaline chromate leach liquor by acidification of the leach liquor to precipitate alumina hydrate which comprises, in combination, passing the leach liquor sequentially through a series of at least two agitated vessels, maintaining the liquor at a temperature of at least about 90*C., and adding acidifying agent to said vessels in amount sufficient to establish gradually decreasing pH levels in the liquor from vessel to vessel in the direction of liquor flow such that the pH in the vessel through which the liquor passes first is maintained within the range of from 10 to 13.5, and the pH in the vessel through which the liquor passes last is maintained within the range of from 6 to 9.5, so that the precipitated alumina hydrate comprises predominantly alumina trihydrate in easily filterable form.

Abstract translation: 本发明涉及通过酸化浸出液以沉淀氧化铝水溶液从碱性铬酸盐浸出液中除去溶解的铝酸盐的方法的改进，其包括将浸出液依次通过一系列至少两个搅拌容器，维持 在至少约90℃的温度下将液体加入到所述容器中，其量足以在液体流动方向上从容器到容器的液体中逐渐降低pH水平，使得容器中的pH 液体首先通过其保持在10至13.5的范围内，并且液体通过的容器中的pH最终保持在6至9.5的范围内，使得沉淀的氧化铝水合物主要包含三水合氧化铝 易于过滤的形式。